CN205507204U - Imaging lens and imaging device - Google Patents
Imaging lens and imaging device Download PDFInfo
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- CN205507204U CN205507204U CN201620114724.3U CN201620114724U CN205507204U CN 205507204 U CN205507204 U CN 205507204U CN 201620114724 U CN201620114724 U CN 201620114724U CN 205507204 U CN205507204 U CN 205507204U
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/22—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances
- G02B15/24—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group
- G02B15/28—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group arranged +-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
- G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
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Abstract
The utility model provides an imaging lens of the burnt mode of cohesion and possess this imaging lens's camera device has suppressed lens system's maximization and F value is less, and aberration change when focusing obtains well revising and to on a large scale object apart from keeping high optical property. The imaging lens accessory things has inclined and has comprised positive first battery of lens (G1), the second battery of lens of bearing (G2), diaphragm, positive third battery of lens (G3) in fact in proper order. Only make second battery of lens (G2) in the rebound of optical axis side and focus. First battery of lens (G1) has 3 above positive lenss and 2 above negative lenses respectively with third battery of lens (G3). Imaging lens satisfy with the focus f2 of second battery of lens (G2) and the state after focusing to the infinity object under entire system's focus f conditions (1) of being correlated with: 0.53 < f2f < 0.9.
Description
Technical Field
The present invention relates to an imaging lens suitable for a camera for movie photography, a camera for broadcasting, a camera for photographing, a video camera, and the like, and an imaging device having the imaging lens.
Background
Conventionally, as an imaging lens used in a camera in the above-mentioned field, an imaging lens of an inner focus (inner focus) system has been proposed in which a part of a lens group in the middle of a lens system is moved to perform focusing. The inner focusing system has advantages of being capable of performing a light focusing operation and a rapid automatic focusing control, compared to the full lens system extension system in which focusing is performed by moving the entire lens system. For example, patent documents 1 and 2 listed below describe an inner-focusing lens system including, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, and focusing is performed by moving the second lens group.
Prior art documents
Patent document 1: japanese patent No. 5429244
Patent document 2: japanese patent No. 4898408
In the camera in the above-described field, it is desirable to have a small F value so as to be able to cope with photography in a dark place and multicolor photographic expression. However, in the telephoto type imaging lens, if an inner focus method is adopted and a small F value is realized, aberration variation at the time of focusing is likely to increase, and it is difficult to maintain good optical performance for an object distance from infinity to the closest.
Patent documents 1 and 2 describe lens systems having an F value in the range of 1.8 to 2.05. However, the lens system described in patent document 1 cannot be considered to be sufficient for correcting various aberrations. In order to realize a high-performance optical system desired in recent years, the lens system described in patent document 2 has room for improvement in correction of spherical aberration and chromatic aberration.
In order to maintain good optical performance over a wide range of object distances, it is also considered to increase the number of lenses, which is not preferable because it leads to an increase in the size of the lens system.
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
The present invention has been made in view of the above circumstances, and provides an image pickup lens of an inner focusing system and an image pickup apparatus including the same, which can suppress the increase in size of a lens system, and which have a small F value, can correct the aberration variation during focusing well, and can maintain high optical performance for a wide range of object distances.
Means for solving the problems
The utility model discloses a camera lens is from the thing side by the first lens group that has positive focal power, the second lens group that has negative focal power, the diaphragm, and the third lens group that has positive focal power constitutes in proper order, only make the second lens group move and focus on the optical axis direction, first lens group has more than 3 positive lenses and more than 2 negative lenses, the second lens group has negative lens, the third lens group has more than 3 positive lenses and more than 2 negative lenses, and satisfy following conditional expression (1):
0.53＜-f2/f＜0.9 (1)
wherein,
f 2: a focal length of the second lens group;
f: focal length of the whole system in the state after focusing to an infinite object.
In the imaging lens of the present invention, it is preferable that any one or any combination of the following conditional expressions (2) to (8), (1-1) to (8-1) is satisfied.
66＜vn2＜98 (2)
0.2＜f1/f3＜0.85 (3)
0.1＜(R3r-R3f)/(R3r+R3f)＜0.5 (4)
0.62＜f1/f＜1.2 (5)
0.6＜f3/f＜2.3 (6)
0.5＜-f1/f2＜1.5 (7)
1.5＜-f3/f2＜4.5 (8)
0.54＜-f2/f＜0.85 (1-1)
0.62＜-f2/f＜0.85 (1-2)
67＜vn2＜88 (2-1)
0.3＜f1/f3＜0.8 (3-1)
0.15＜(R3r-R3f)/(R3r+R3f)＜0.45 (4-1)
0.65＜f1/f＜1 (5-1)
0.65＜f3/f＜1.9 (6-1)
0.6＜-f1/f2＜1.4 (7-1)
1.6＜-f3/f2＜4 (8-1)
Wherein,
vn 2: abbe number of the negative lens closest to the image side of the second lens group based on d-line;
f 1: a focal length of the first lens group;
f 2: a focal length of the second lens group;
f 3: a focal length of the third lens group;
f: focal length of the whole system in a state of focusing on an infinite object;
r3 f: a radius of curvature of an object-side surface of the positive lens closest to the image side of the third lens group;
R3R: and a radius of curvature of an image-side surface of the most image-side positive lens of the third lens group.
In the imaging lens of the present invention, it is preferable that the first lens group has a cemented lens in which a biconvex lens and a biconcave lens are cemented in this order from the object side.
The imaging lens of the present invention may be such that the second lens group substantially comprises 1 negative lens, or the second lens group substantially comprises a cemented lens formed by joining 1 negative lens and 1 positive lens.
The term "substantially" in the above-mentioned "substantially consisting of" means that the optical lens may include, in addition to the components already listed, optical elements other than lenses having substantially no refractive power, such as an aperture, a glass cover, and a filter, and mechanical parts such as a lens flange, a lens barrel, and a camera-shake correction mechanism.
In the imaging lens of the present invention, the refractive power index of the lens group, the refractive power index of the lens, the surface shape of the lens, and the value of the radius of curvature are considered in the paraxial region when the aspherical surface is included.
The utility model discloses a camera device possesses the utility model discloses a lens of making a video recording.
Effect of the utility model
According to the present invention, in a lens system which is substantially composed of a positive first lens group, a negative second lens group, a stop, and a positive third lens group in this order from an object side, and in which only the second lens group moves during focusing, since the lens structures of the first lens group and the third lens group are appropriately set and predetermined conditional expressions are satisfied, it is possible to provide an image pickup lens of an inner focusing system which suppresses an increase in size of the lens system, has a small F value, satisfactorily corrects aberration variation during focusing, and can maintain high optical performance for a wide range of object distances, and an image pickup apparatus including the image pickup lens,
drawings
Fig. 1 is a sectional view showing the structure of an imaging lens according to embodiment 1 of the present invention.
Fig. 2 is a sectional view showing the structure of an imaging lens according to embodiment 2 of the present invention.
Fig. 3 is a sectional view showing the structure of an imaging lens according to embodiment 3 of the present invention.
Fig. 4 is a sectional view showing the structure of an imaging lens according to embodiment 4 of the present invention.
Fig. 5 is a sectional view showing the structure of an imaging lens according to embodiment 5 of the present invention.
Fig. 6 is each aberration diagram of the imaging lens according to example 1 of the present invention, and shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left.
Fig. 7 is an aberration diagram of an imaging lens according to example 2 of the present invention, and shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left.
Fig. 8 is an aberration diagram of an imaging lens according to example 3 of the present invention, and shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a magnification chromatic aberration diagram in this order from the left.
Fig. 9 is an aberration diagram of an imaging lens according to example 4 of the present invention, and shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a chromatic aberration of magnification diagram in this order from the left.
Fig. 10 is an aberration diagram of an imaging lens according to example 5 of the present invention, and shows a spherical aberration diagram, an astigmatism diagram, a distortion aberration diagram, and a chromatic aberration of magnification diagram in this order from the left.
Fig. 11 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 to 5 are cross-sectional views showing the structure of an imaging lens according to an embodiment of the present invention, and correspond to examples 1 to 5 described later. In fig. 1 to 5, the left side is the object side, and the right side is the image side, and the state after focusing on an infinite object is shown. Since the basic configuration and the illustration method of the example shown in fig. 1 to 5 are the same, the following description will be given mainly with reference to the configuration example shown in fig. 1 as a representative example.
The imaging lens is substantially composed of, in order from the object side along the optical axis Z, a first lens group G1 having positive power, a second lens group G2 having negative power, an aperture stop St, and a third lens group G3 having positive power. The aperture stop St shown in fig. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
This imaging lens is an inner focus type lens system that performs focusing by moving only the second lens group G2 in the optical axis direction. The example shown in fig. 1 is a case where the second lens group G2 moves to the image side when focusing from an infinity object to a closest object, and in fig. 1, an arrow indicating the moving direction is shown below the second lens group G2.
When the imaging lens is applied to an imaging device, it is considered that various filters such as an infrared cut filter and a low-pass filter, a glass cover, and the like are arranged between the lens system and the image plane Sim depending on the configuration of the imaging device, and therefore fig. 1 shows an example in which a parallel flat plate-shaped optical member PP assumed to be provided with the above-described members is arranged between the lens system and the image plane Sim. However, the position of the optical member PP is not limited to the position shown in fig. 1, and a configuration in which the optical member PP is omitted may be employed.
By providing the first lens group G1 as a lens group having positive power, shortening of the total length of the lens system is facilitated. The first lens group G1 has 3 or more positive lenses and 2 or more negative lenses. The positive power of the first lens group G1 can be shared by 3 or more positive lenses, the total length of the lens system can be appropriately shortened, and spherical aberration can be favorably corrected, which is advantageous for achieving a small F value. In addition, the lens has more than 2 negative lenses, thereby being beneficial to the good correction of chromatic aberration, astigmatism and image plane curvature.
For example, as in the example shown in fig. 1, the first lens group G1 may be configured by 5 lenses, i.e., a positive lens L11, a positive lens L12, a negative lens L13, a negative lens L14, and a positive lens L15, in this order from the object side. Alternatively, as in the example shown in fig. 2 to 5, the first lens group G1 may be configured by 6 lenses, i.e., a positive lens L11, a positive lens L11b, a positive lens L12, a negative lens L13, a negative lens L14, and a positive lens L15, in this order from the object side. In the case of the 5-piece structure or the 6-piece structure, positive power of the first lens group G1 can be shared by the lenses L11, L11b, and L12, respectively, and the total length of the lens system can be appropriately shortened, spherical aberration can be appropriately corrected, a small F value can be advantageously achieved, axial chromatic aberration, chromatic aberration of magnification, astigmatism, and field curvature can be appropriately corrected by the lenses L13 and L14, respectively, positive power of the first lens group G1 can be shared by the lens L15, and the total length of the lens system can be appropriately shortened. In the case of the 5-piece structure or the 6-piece structure, the lens L12 may be bonded to the lens L13, or the lens L14 may be bonded to the lens L15.
The first lens group G1 preferably includes a cemented lens in which a biconvex lens and a biconcave lens are cemented in this order from the object side. In such a case, the chromatic aberration can be corrected well.
The second lens group G2 has at least 1 negative lens. The second lens group G2 is only one of the three lens groups having negative refractive power, and by setting the second lens group G2 as a focus group that moves during focusing, the amount of movement of the focus group during focusing can be suppressed, and the total length of the lens system can be shortened.
The second lens group G2 may be formed of one lens component. In such a case, the mechanical mechanism for moving the focus group can be simplified. The term "lens component" as used herein refers to a lens in which the air contact surfaces on the optical axis are only the two surfaces, i.e., the object-side surface and the image-side surface, and one lens component refers to one single lens or 1 group of combined lenses.
Specifically, for example, the second lens group G2 may be substantially composed of a cemented lens in which 1 positive lens L2p and 1 negative lens L2n are cemented, as in the example shown in fig. 1, 2, and 5. With such a configuration, it is possible to easily correct chromatic aberration and spherical aberration during focusing, and to reduce the weight of the focus group. Alternatively, the second lens group G2 may be substantially composed of 1 negative lens L2n as in the examples shown in fig. 3 and 4. In the case of such a configuration, correction of spherical aberration at the time of focusing is facilitated, and weight reduction of the focus group can be achieved. The weight reduction of the focusing group is effective for a telescopic type optical system in which the weight of the lens system is liable to become heavy.
The third lens group G3 is a lens group having positive optical power. This can suppress the effective diameter of the lens in the first lens group G1, reduce the size of the lens system, and contribute to correction of various aberrations. The third lens group G3 has 3 or more positive lenses and 2 or more negative lenses. The positive power of the third lens group G3 can be shared by 3 or more positive lenses, the total length of the lens system can be appropriately shortened, and spherical aberration can be favorably corrected, which is advantageous for achieving a small F value. In addition, the lens has more than 2 negative lenses, thereby being beneficial to the good correction of chromatic aberration, astigmatism and image plane curvature.
For example, the third lens group G3 may be configured to include 5 lenses, i.e., a negative lens L31, a positive lens L32, a positive lens L33, a negative lens L34, and a positive lens L35, in this order from the object side, as in the examples shown in fig. 1 to 3 and 5. Alternatively, the third lens group G3 may be configured to include 6 lenses, i.e., a negative lens L31, a positive lens L32, a positive lens L33, a negative lens L34, a negative lens L34b, and a positive lens L35, in this order from the object side, as in the example shown in fig. 4. In the case of the 5-piece structure or the 6-piece structure, astigmatism, field curvature, and chromatic aberration can be favorably corrected by the lens L31, the total length of the lens system can be appropriately shortened by the lens L32, the effective diameter of the lens in the first lens group G1 can be suppressed, the lens system can be downsized, astigmatism, field curvature, and chromatic aberration can be favorably corrected by the respective lenses L33, L34, and L34b, and the effective diameter of the lens in the first lens group G1 can be suppressed by the lens L35, and the lens system can be downsized. In the case of the 5-piece structure or the 6-piece structure, the lens L31 may be bonded to the lens L32, or the lens L33 may be bonded to the lens L34.
When the third lens group G3 has the 5-piece structure or the 6-piece structure, the image may be shifted to compensate for vibration by moving the lens L33 and the lens L34 in a direction perpendicular to the optical axis. In such a case, even if the movement amounts of the lens L33 and the lens L34 are small, a large amount of change in image position on the image plane Sim can be obtained, and it is possible to reduce the size of the apparatus and ensure good image performance.
The imaging lens satisfies the following conditional expression (1).
0.53＜-f2/f＜0.9 (1)
Wherein,
f 2: a focal length of the second lens group;
f: focal length of the whole system in the state after focusing to an infinite object.
By not lowering-f 2/f to the lower limit of the conditional expression (1) or less, the power of the second lens group G2 can be suppressed, and the axial chromatic aberration can be easily corrected. Further, by not making-f 2/f equal to or less than the lower limit of conditional expression (1), it is possible to prevent excessive correction of spherical aberration when focusing on an object close to infinity, and to uniformly suppress variations in spherical aberration and astigmatism when changing from a state of focusing on an object at infinity to a state of focusing on an object close to infinity. By not making-f 2/f equal to or higher than the upper limit of conditional expression (1), the refractive power of the second lens group G2 can be secured, the amount of movement of the second lens group G2 during focusing can be suppressed, and the total length of the lens system can be shortened.
In order to further enhance the effect of the conditional expression (1), the following conditional expression (1-1) is preferably satisfied, and the following conditional expression (1-2) is more preferably satisfied.
0.54＜-f2/f＜0.85 (1-1)
0.62＜-f2/f＜0.85 (1-2)
Further, the imaging lens preferably satisfies any one of or any combination of the following conditional expressions (2) to (8).
66＜vn2＜98 (2)
0.2＜f1/f3＜0.85 (3)
0.1＜(R3r-R3f)/(R3r+R3f)＜0.5 (4)
0.62＜f1/f＜1.2 (5)
0.6＜f3/f＜2.3 (6)
0.5＜-f1/f2＜1.5 (7)
1.5＜-f3/f2＜4.5 (8)
Wherein,
vn 2: abbe number of the negative lens closest to the image side of the second lens group based on d-line;
f 1: a focal length of the first lens group;
f 3: a focal length of the third lens group;
f: focal length of the whole system in a state of focusing on an infinite object;
r3 f: a radius of curvature of an object-side surface of the positive lens closest to the image side of the third lens group;
R3R: a radius of curvature of an image side surface of the positive lens closest to the image side of the third lens group;
by not making vn2 equal to or less than the lower limit of conditional expression (2), correction of the on-axis chromatic aberration at the time of focusing can be easily performed. By not making vn2 equal to or higher than the upper limit of conditional expression (2), it is easy to correct chromatic aberration in focusing, particularly chromatic aberration of magnification.
By not lowering f1/f3 to the lower limit or less of conditional expression (3), the power of the first lens group G1 can be prevented from being excessively increased, and astigmatism and field curvature can be suppressed. Or the power of the third lens group G3 can be prevented from being excessively weakened, thus contributing to shortening of the total length of the lens system. By not making f1/f3 equal to or more than the upper limit of conditional expression (3), the power of the first lens group G1 can be prevented from being excessively weakened, and therefore the effective diameter of the lenses of the first lens group G1 can be suppressed, and the lens system can be downsized. Or the power of the third lens group G3 can be prevented from being excessively strengthened, and therefore the back focal length can be ensured.
Spherical aberration can be suppressed by not making (R3R-R3f)/(R3R + R3f) the lower limit of conditional expression (4) or less. By not making (R3R-R3f)/(R3R + R3f) the upper limit of conditional expression (4) or more, field curvature can be suppressed.
By not lowering f1/f to the lower limit of conditional expression (5) or less, the power of the first lens group G1 can be prevented from being excessively increased, and astigmatism and field curvature can be suppressed. By not making f1/f equal to or higher than the upper limit of conditional expression (5), the power of the first lens group G1 can be prevented from being excessively reduced, and therefore, the total length of the lens system can be reduced.
By not lowering f3/f to the lower limit of conditional expression (6) or less, the power of the third lens group G3 can be prevented from being excessively strengthened, so that spherical aberration can be suppressed, or the back focus can be secured. By not making f3/f equal to or higher than the upper limit of conditional expression (6), the power of the third lens group G3 can be prevented from being excessively reduced, and therefore, the total length of the lens system can be reduced.
When both the conditional expression (5) and the conditional expression (6) are satisfied, it is easy to shorten the total length of the lens system and correct each aberration well.
By not lowering-f 1/f2 to the lower limit of conditional expression (7) or less, the power of the first lens group G1 can be prevented from being excessively strengthened, and the power of the second lens group G2 can be prevented from being excessively weakened, whereby spherical aberration, particularly spherical aberration when focusing on a near object, can be corrected favorably. By not making-f 1/f2 equal to or more than the upper limit of conditional expression (7), the power of the first lens group G1 can be prevented from being excessively weakened, and the power of the second lens group G2 can be prevented from being excessively strengthened, so that excessive correction of spherical aberration can be avoided.
By not lowering-f 3/f2 to the lower limit of conditional expression (8) or less, the power of the third lens group G3 can be prevented from being excessively strengthened, and the power of the second lens group G2 can be prevented from being excessively weakened, whereby spherical aberration can be corrected well and the back focus can be secured. By not making-f 3/f2 equal to or more than the upper limit of conditional expression (8), the power of the third lens group G3 can be prevented from being excessively weakened, and the power of the second lens group G2 can be prevented from being excessively strengthened, so that it is possible to contribute to shortening the total lens system length, and to suppress spherical aberration and axial chromatic aberration.
When both the conditional expression (7) and the conditional expression (8) are satisfied, spherical aberration can be corrected easily and favorably, and a small F value can be realized.
In order to further enhance the effects of the conditional expressions (2) to (8), it is more preferable that the following conditional expressions (2-1) to (8-1) are satisfied instead of the conditional expressions (2) to (8).
67＜vn2＜88 (2-1)
0.3＜f1/f3＜0.8 (3-1)
0.15＜(R3r-R3f)/(R3r+R3f)＜0.45 (4-1)
0.65＜f1/f＜1 (5-1)
0.65＜f3/f＜1.9 (6-1)
0.6＜-f1/f2＜1.4 (7-1)
1.6＜-f3/f2＜4 (8-1)
The preferred configurations and possible configurations described above can be arbitrarily combined and preferably selectively employed as appropriate in accordance with the required specifications. For example, by appropriately adopting the above configuration, it is possible to configure an image pickup lens of an inner focus system in which an increase in size of a lens system is suppressed, an F value is small, aberration variation in focusing is favorably corrected, and high optical performance can be maintained for a wide range of object distances. Here, the small F value means that the F value is 2.0 or less in a state of being focused on an infinitely distant object.
Next, a numerical example of the imaging lens of the present invention will be explained. Examples 1 to 5 shown below were normalized so that the focal length of the entire system in the state of focusing on an infinitely distant object was 100.0.
[ example 1]
Fig. 1 is a block diagram of an imaging lens of example 1. The imaging lens of embodiment 1 is constituted by the first lens group G1, the second lens group G2, the aperture stop St, and the third lens group G3 in this order from the object side. The focusing group is only the second lens group G2, and the second lens group G2 moves to the image side when focusing from an infinity object to a closest object. The first lens group G1 is composed of 5 lenses L11 to L15 in this order from the object side, the second lens group G2 is composed of 2 lenses L2p and L2n in this order from the object side, and the third lens group G3 is composed of 5 lenses L31 to L35 in this order from the object side.
Table 1 shows basic lens data of the imaging lens of example 1, and table 2 shows values of various factors and variable surface intervals. In table 1, the column Si shows the number of the ith (i: 1, 2, 3,..) surface, which increases in order from the 1 st surface of the component closest to the object side toward the image side, the column Ri shows the radius of curvature of the ith surface, and the column Di shows the surface interval on the optical axis Z between the ith surface and the (i + 1) th surface. Note that, the sign of the curvature radius is positive in the shape of the surface of the convex surface facing the object side and negative in the shape of the surface of the convex surface facing the image side.
Table 1 shows, in a column Ndj, refractive indices of the j-th (j 1, 2, 3, and..) optical element with respect to the d-line (wavelength 587.6nm) in which the element closest to the object side is the 1 st element, and the j-th optical element with respect to the d-line increases sequentially toward the image side, and in a column vdj, the abbe number of the j-th optical element with respect to the d-line is shown. Table 1 also shows the aperture stop St, the optical member PP, and the image plane Sim. In table 1, the term of the face number (St) is described in the column of the face number of the face corresponding to the aperture stop St, and the term of the face number (Sim) is described in the column of the face number of the face corresponding to the image plane Sim. In table 1, the variable surface interval that changes in focusing is denoted by a symbol DD [ ], and the surface number on the object side of the interval is denoted in [ ].
In table 2, values of the lateral magnification β, the focal length F' of the entire system, the F value fno, the maximum full field angle 2 ω, and the variable plane spacing are shown on the d-line basis. The units are [ ° ] of the column 2 ω. In table 2, the respective values in the state after focusing on the object at infinity, the state after focusing on the object at the intermediate position, and the state after focusing on the object at the closest position are shown in the columns recorded as infinity, intermediate, and closest. In each table shown below, numerical values rounded to a predetermined number of digits are described.
[ Table 1]
Example 1
| Si | Ri | Di | Ndj | v dj |
| 1 | 400.3424 | 6.7438 | 1.48749 | 70.24 |
| 2 | -168.2879 | 0.3929 | ||
| 3 | 61.6551 | 10.2699 | 1.43875 | 94.94 |
| 4 | -136.3968 | 1.7393 | 1.80610 | 40.93 |
| 5 | 496.9335 | 1.4187 | ||
| 6 | 46.2150 | 7.6391 | 1.81600 | 46.62 |
| 7 | 30.1158 | 8.3276 | 1.49700 | 81.54 |
| 8 | 514.9436 | DD[8] | ||
| 9 | -210.8993 | 2.7831 | 1.84666 | 23.88 |
| 10 | -106.8861 | 5.8171 | 1.59522 | 67.73 |
| 11 | 36.5648 | DD[11] | ||
| 12(St) | ∞ | 1.6665 | ||
| 13 | 31.9856 | 6.1569 | 1.88300 | 40.76 |
| 14 | 21.3768 | 8.1740 | 1.59522 | 67.73 |
| 15 | -100.3293 | 2.1109 | ||
| 16 | 52.7420 | 4.8045 | 1.84666 | 23.88 |
| 17 | 105.3092 | 8.0876 | 1.88300 | 40.76 |
| 18 | 16.3508 | 8.3325 | ||
| 19 | 19.7037 | 8.3324 | 1.48749 | 70.24 |
| 20 | 41.1981 | 12.6433 | ||
| 21 | ∞ | 1.1110 | 1.51633 | 64.14 |
| 22 | ∞ | 4.0962 | ||
| 23(Sim) | ∞ |
[ Table 2]
Example 1
| Infinity | Intermediate (II) | At the nearest position | |
| β | 0.00 | -0.02 | -0.05 |
| f′ | 100.0 | 97.48 | 94.90 |
| FNo. | 1.93 | 1.97 | 2.01 |
| 2ω[°] | 10.8 | 10.6 | 10.2 |
| DD[8] | 2.29 | 3.65 | 5.07 |
| DD[11] | 10.41 | 9.04 | 7.63 |
Fig. 6 shows aberration diagrams of the imaging lens of example 1. In fig. 6, the spherical aberration, astigmatism, distortion aberration (aberration), and magnification chromatic aberration (chromatic aberration) in a state of being focused on an infinitely distant object are shown in order from the left in the upper part, the spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in a state of being focused on an intermediate object are shown in order from the left in the middle part, and the spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration in a state of being focused on a nearest object are shown in order from the left in the lower part. In the spherical aberration diagram, aberrations with respect to the d-line (wavelength 587.6nm), C-line (wavelength 656.3nm), and F-line (wavelength 486.1nm) are shown by a black solid line, a long broken line, and a short broken line, respectively. In the astigmatism diagrams, the radial and tangential aberrations with respect to the d-line are shown by a solid line and a short dashed line, and the signs (S) and (T) are described in the description of the line types. In the distortion aberration diagram, the aberration with respect to the d-line is shown by a solid line. In the chromatic aberration of magnification diagram, aberrations about the C-line and the F-line are shown by a long dashed line and a short dashed line, respectively. Fno of the spherical aberration diagram indicates the F value, and ω of the other aberration diagrams indicates the half field angle.
The symbols, meanings, and description methods of the respective data described in the above description of embodiment 1 are the same in the following embodiments unless otherwise described, and therefore, the repetitive description thereof will be omitted below.
[ example 2]
Fig. 2 is a block diagram of an imaging lens of example 2. The imaging lens of embodiment 2 is constituted by the first lens group G1, the second lens group G2, the aperture stop St, and the third lens group G3 in this order from the object side. The focusing group is only the second lens group G2, and the second lens group G2 moves to the image side when focusing from an infinity object to a closest object. The first lens group G1 is composed of 6 lenses of lenses L11, L11b, and L12 to L15 in order from the object side, the second lens group G2 is composed of 2 lenses of lenses L2p and L2n in order from the object side, and the third lens group G3 is composed of 5 lenses of lenses L31 to L35 in order from the object side. Table 3 shows basic lens data of the imaging lens of example 2, and table 4 shows values of various factors and variable surface intervals. Fig. 7 shows aberration diagrams of the imaging lens of example 2.
[ Table 3]
Example 2
| Si | Ri | Di | Ndj | v dj |
| 1 | 162.0569 | 4.1037 | 1.48749 | 70.24 |
| 2 | -824.4278 | 0.0556 | ||
| 3 | 69.3059 | 6.7493 | 1.48749 | 70.24 |
| 4 | 412.4028 | 0.3933 | ||
| 5 | 66.2963 | 8.0791 | 1.49700 | 81.54 |
| 6 | -177.8554 | 2.7833 | 1.78800 | 47.37 |
| 7 | 100.5520 | 1.2652 | ||
| 8 | 52.1313 | 3.2997 | 1.78800 | 47.37 |
| 9 | 32.5626 | 8.3394 | 1.49700 | 81.54 |
| 10 | 2249.8073 | DD[10] | ||
| 11 | -185.5510 | 5.3523 | 1.92286 | 18.90 |
| 12 | -116.8106 | 4.0497 | 1.48749 | 70.24 |
| 13 | 30.8514 | DD[13] | ||
| 14(St) | ∞ | 0.1501 | ||
| 15 | 34.6128 | 2.2294 | 1.88300 | 40.76 |
| 16 | 25.4105 | 6.2478 | 1.59522 | 67.73 |
| 17 | -83.0447 | 2.1126 | ||
| 18 | 82.5951 | 8.1978 | 1.84666 | 23.88 |
| 19 | 131.9355 | 4.3777 | 1.74400 | 44.79 |
| 20 | 16.9566 | 8.3394 | ||
| 21 | 19.6778 | 7.8486 | 1.49700 | 81.54 |
| 22 | 37.4682 | 12.6535 | ||
| 23 | ∞ | 1.1119 | 1.51633 | 64.14 |
| 24 | ∞ | 3.3577 | ||
| 25(Sim) | ∞ |
[ Table 4]
Example 2
| Infinity | Intermediate (II) | At the nearest position | |
| β | 0.00 | -0.02 | -0.03 |
| f′ | 100.0 | 97.42 | 94.79 |
| FNo. | 1.91 | 1.94 | 1.98 |
| 2ω[°] | 10.8 | 10.6 | 10.2 |
| DD[10] | 5.53 | 6.99 | 8.50 |
| DD[13] | 11.81 | 10.35 | 8.83 |
[ example 3]
The configuration of the imaging lens of example 3 is shown in fig. 3. The imaging lens of embodiment 3 is constituted by the first lens group G1, the second lens group G2, the aperture stop St, and the third lens group G3 in this order from the object side. The focusing group is only the second lens group G2, and the second lens group G2 moves to the image side when focusing from an infinity object to a closest object. The first lens group G1 is composed of 6 lenses of lenses L11, L11b, and L12 to L15 in order from the object side, the second lens group G2 is composed of only lens L2n, and the third lens group G3 is composed of 5 lenses of lenses L31 to L35 in order from the object side. Table 5 shows basic lens data of the imaging lens of example 3, and table 6 shows values of various factors and variable surface intervals. Fig. 8 shows aberration diagrams of the imaging lens of example 3.
[ Table 5]
Example 3
| Si | Ri | Di | Ndj | v dj |
| 1 | 78.9995 | 6.7523 | 1.48749 | 70.24 |
| 2 | 297.4701 | 0.0555 | ||
| 3 | 100.9196 | 6.7584 | 1.84666 | 23.78 |
| 4 | 958.4680 | 0.3938 | ||
| 5 | 52.4120 | 10.6602 | 1.49700 | 81.54 |
| 6 | -236.6176 | 3.8971 | 1.95375 | 32.32 |
| 7 | 107.3771 | 2.0990 | ||
| 8 | 88.4282 | 3.2539 | 1.80518 | 25.42 |
| 9 | 35.2729 | 7.1969 | 1.53775 | 74.70 |
| 10 | 525.8297 | DD[10] | ||
| 11 | -937.0024 | 3.4880 | 1.49700 | 81.54 |
| 12 | 39.0050 | DD[12] | ||
| 13(St) | ∞ | 0.4407 | ||
| 14 | 46.9427 | 3.9251 | 1.78470 | 26.29 |
| 15 | 23.2143 | 6.6928 | 1.53775 | 74.70 |
| 16 | -133.1981 | 2.1155 | ||
| 17 | 90.2737 | 5.5514 | 1.92286 | 18.90 |
| 18 | -31.7692 | 8.1193 | 1.76182 | 26.52 |
| 19 | 19.9274 | 8.3507 | ||
| 20 | 23.1865 | 8.3507 | 1.68893 | 31.07 |
| 21 | 39.8334 | 12.6706 | ||
| 22 | ∞ | 1.1134 | 1.51633 | 64.14 |
| 23 | ∞ | 3.2942 | ||
| 24(Sim) | ∞ |
[ Table 6]
Example 3
| Infinity | Intermediate (II) | At the nearest position | |
| β | 0.00 | -0.01 | -0.02 |
| f′ | 100.0 | 97.56 | 95.07 |
| FNo. | 1.90 | 1.90 | 1.90 |
| 2ω[°] | 10.8 | 10.6 | 10.2 |
| DD[10] | 1.12 | 2.90 | 4.77 |
| DD[12] | 12.27 | 10.49 | 8.62 |
[ example 4]
The configuration of the imaging lens of example 4 is shown in fig. 4. The imaging lens of embodiment 4 is constituted by the first lens group G1, the second lens group G2, the aperture stop St, and the third lens group G3 in this order from the object side. The focusing group is only the second lens group G2, and the second lens group G2 moves to the image side when focusing from an infinity object to a closest object. The first lens group G1 is composed of 6 lenses, i.e., lenses L11, L11b, and L12 to L15, in order from the object side, the second lens group G2 is composed of only lens L2n, and the third lens group G3 is composed of 6 lenses, i.e., lenses L31 to L34, L34b, and L35, in order from the object side. Table 7 shows basic lens data of the imaging lens of example 4, and table 8 shows values of various factors and variable surface intervals. Fig. 9 shows aberration diagrams of the imaging lens of example 4.
[ Table 7]
Example 4
| Si | Ri | Di | Ndj | v dj |
| 1 | 75.7038 | 4.6287 | 1.48749 | 70.24 |
| 2 | 165.6445 | 0.5569 | ||
| 3 | 102.3409 | 6.7598 | 1.84666 | 23.78 |
| 4 | 1139.6874 | 0.3939 | ||
| 5 | 48.1118 | 10.2518 | 1.49700 | 81.54 |
| 6 | -206.4169 | 3.8979 | 1.95375 | 32.32 |
| 7 | 115.1095 | 2.1361 | ||
| 8 | 85.6576 | 3.1884 | 1.80518 | 25.42 |
| 9 | 35.7581 | 6.5044 | 1.53775 | 74.70 |
| 10 | 811.1627 | DD[10] | ||
| 11 | -800.9298 | 2.7840 | 1.49700 | 81.54 |
| 12 | 34.7658 | DD[12] | ||
| 13(St) | ∞ | 0.0556 | ||
| 14 | 49.8608 | 2.2329 | 1.78470 | 26.29 |
| 15 | 22.7573 | 6.7512 | 1.53775 | 74.70 |
| 16 | -104.9717 | 2.1159 | ||
| 17 | 93.1483 | 5.7744 | 1.92286 | 18.90 |
| 18 | -27.9290 | 7.3129 | 1.76182 | 26.52 |
| 19 | 450.2841 | 0.8896 | ||
| 20 | -2701.4944 | 6.3205 | 1.80518 | 25.42 |
| 21 | 20.9025 | 6.5929 | ||
| 22 | 22.7752 | 8.3257 | 1.62588 | 35.70 |
| 23 | 44.4258 | 12.6732 | ||
| 24 | ∞ | 1.1136 | 1.51633 | 64.14 |
| 25 | ∞ | 3.6881 | ||
| 26(Sim) | ∞ |
[ Table 8]
Example 4
| Infinity | Intermediate (II) | At the nearest position | |
| β | 0.00 | -0.01 | -0.03 |
| f′ | 100.0 | 97.36 | 94.70 |
| FNo. | 1.90 | 1.90 | 1.90 |
| 2ω[°] | 11.0 | 10.6 | 10.2 |
| DD[10] | 1.05 | 2.59 | 4.19 |
| DD[12] | 12.71 | 11.17 | 9.57 |
[ example 5]
Fig. 5 is a block diagram of an imaging lens of example 5. The imaging lens of embodiment 5 is constituted by the first lens group G1, the second lens group G2, the aperture stop St, and the third lens group G3 in this order from the object side. The focusing group is only the second lens group G2, and the second lens group G2 moves to the image side when focusing from an infinity object to a closest object. The first lens group G1 is composed of 6 lenses of lenses L11, L11b, and L12 to L15 in order from the object side, the second lens group G2 is composed of 2 lenses of lenses L2p and L2n in order from the object side, and the third lens group G3 is composed of 5 lenses of lenses L31 to L35 in order from the object side. Table 9 shows basic lens data of the imaging lens of example 5, and table 10 shows values of various factors and variable surface intervals. Fig. 10 shows aberration diagrams of the imaging lens of example 5.
[ Table 9]
Example 5
| Si | Ri | Di | Ndj | v dj |
| 1 | 383.0355 | 3.6110 | 1.48749 | 70.24 |
| 2 | -310.9583 | 0.0556 | ||
| 3 | 76.4886 | 6.7446 | 1.48749 | 70.24 |
| 4 | 499.1253 | 0.3930 | ||
| 5 | 58.9244 | 8.6694 | 1.49700 | 81.54 |
| 6 | -169.4609 | 2.7778 | 1.78800 | 47.37 |
| 7 | 98.3216 | 1.3340 | ||
| 8 | 50.7202 | 2.7833 | 1.78800 | 47.37 |
| 9 | 32.5176 | 8.3335 | 1.49700 | 81.54 |
| 10 | -1421.9893 | DD[10] | ||
| 11 | -190.1831 | 5.1870 | 1.92286 | 18.90 |
| 12 | -113.8834 | 4.4052 | 1.48749 | 70.24 |
| 13 | 31.9482 | DD[13] | ||
| 14(St) | ∞ | 0.7945 | ||
| 15 | 34.6333 | 2.2281 | 1.88300 | 40.76 |
| 16 | 25.8206 | 6.1211 | 1.59522 | 67.73 |
| 17 | -92.5123 | 2.1111 | ||
| 18 | 81.4665 | 8.1521 | 1.84666 | 23.88 |
| 19 | 122.5080 | 3.9411 | 1.74400 | 44.79 |
| 20 | 16.6545 | 8.3335 | ||
| 21 | 19.9100 | 7.8228 | 1.49700 | 81.54 |
| 22 | 38.0541 | 12.6446 | ||
| 23 | ∞ | 1.1111 | 1.51633 | 64.14 |
| 24 | ∞ | 3.3971 | ||
| 25(Sim) | ∞ |
[ Table 10]
Example 5
| Infinity | Intermediate (II) | At the nearest position | |
| β | 0.00 | -0.02 | -0.03 |
| f′ | 100.00 | 97.29 | 94.55 |
| FNo. | 1.94 | 1.98 | 2.01 |
| 2ω[°] | 10.8 | 10.4 | 10.2 |
| DD[10] | 5.59 | 7.03 | 8.52 |
| DD[13] | 11.76 | 10.32 | 8.83 |
Table 11 shows the corresponding values of conditional expressions (1) to (8) of the imaging lenses of examples 1 to 5. The values shown in table 11 are based on the d-line.
[ Table 11]
| Formula number | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| (1) | -f2/f | 0.55 | 0.58 | 0.75 | 0.67 | 0.61 |
| (2) | v n2 | 67.73 | 70.24 | 81.54 | 81.54 | 70.24 |
| (3) | f1/f3 | 0.79 | 0.68 | 0.51 | 0.52 | 0.57 |
| (4) | (R3r-R3f)/(R3r+R3f) | 0.35 | 0.31 | 0.26 | 0.32 | 0.31 |
| (5) | f1/f | 0.72 | 0.72 | 0.75 | 0.72 | 0.71 |
| (6) | f3/f | 0.92 | 1.06 | 1.49 | 1.38 | 1.23 |
| (7) | -f1/f2 | 1.30 | 1.25 | 1.00 | 1.08 | 1.17 |
| (8) | -f3/f2 | 1.66 | 1.83 | 1.97 | 2.06 | 2.03 |
As is clear from the above data, the imaging lenses of examples 1 to 5 have a compact structure with a reduced size in the optical axis direction and the radial direction, and have a small F value with an F value in a range of 1.9 to 2.0 in a state of focusing on an infinitely distant object, and have little aberration variation during focusing, and achieve high optical performance for a wide range of object distances.
Next, an image pickup apparatus according to an embodiment of the present invention will be described. Fig. 11 is a schematic configuration diagram of an imaging apparatus 10 using an imaging lens 1 according to an embodiment of the present invention, as an example of the imaging apparatus according to the embodiment of the present invention. Examples of the imaging device 10 include a film camera, a broadcasting camera, a photographing camera, and a video camera.
The imaging device 10 includes an imaging lens 1, an optical filter 2 disposed on the image side of the imaging lens 1, and an imaging element 3 disposed on the image side of the optical filter 2. The image pickup lens 1 has a first lens group G1, a second lens group G2, and a third lens group G3. In fig. 11, each lens group is schematically illustrated, and a stop included in the imaging lens 1 is not illustrated. The imaging element 3 converts an optical image formed by the imaging lens 1 into an electric signal, and for example, a CCD (charge C0up Device), a CMOS (CMOS) or the like can be used. The image pickup device 3 is disposed so that an image pickup surface thereof coincides with an image pickup surface of the image pickup lens 1.
The imaging device 10 further includes a signal processing unit 5 that performs arithmetic processing on an output signal from the imaging element 3, a display unit 6 that displays an image formed by the signal processing unit 5, and a focus control unit 8 that controls focusing of the imaging lens 1. In fig. 11, only one image pickup device 3 is illustrated, but the image pickup apparatus of the present invention is not limited to this, and a so-called three-plate type image pickup apparatus having three image pickup devices may be adopted.
The present invention has been described above by way of the embodiments and examples, but the present invention is not limited to the above embodiments and examples, and various modifications are possible. For example, the values of the curvature radius, the surface interval, the refractive index, the abbe number, and the like of each lens are not limited to the values shown in the numerical examples, and other values may be adopted.
Claims (20)
1. An imaging lens characterized in that,
the image pickup lens is composed of a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm and a third lens group with positive focal power in sequence from the object side,
focusing is performed by moving only the second lens group in the optical axis direction,
the first lens group has 3 or more positive lenses and 2 or more negative lenses,
the second lens group has a negative lens,
the third lens group has 3 or more positive lenses and 2 or more negative lenses,
the imaging lens satisfies the following conditional expression (1):
0.53＜-f2/f＜0.9 (1)
wherein,
f 2: a focal length of the second lens group;
f: focal length of the whole system in the state after focusing to an infinite object.
2. The imaging lens according to claim 1,
the imaging lens satisfies the following conditional expression (2):
66＜vn2＜98 (2)
wherein,
vn 2: and an Abbe number of a d-line reference of a negative lens closest to the image side of the second lens group.
3. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (3):
0.2＜f1/f3＜0.85 (3)
wherein,
f 1: a focal length of the first lens group;
f 3: a focal length of the third lens group.
4. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (4):
0.1＜(R3r-R3f)/(R3r+R3f)＜0.5 (4)
wherein,
r3 f: a radius of curvature of an object-side surface of a positive lens closest to the image side of the third lens group;
R3R: and a radius of curvature of an image-side surface of the positive lens closest to the image side of the third lens group.
5. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (5):
0.62＜f1/f＜1.2 (5)
wherein,
f 1: a focal length of the first lens group.
6. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (6):
0.6＜f3/f＜2.3 (6)
wherein,
f 3: a focal length of the third lens group.
7. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (7):
0.5＜-f1/f2＜1.5 (7)
wherein,
f 1: a focal length of the first lens group.
8. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (8):
1.5＜-f3/f2＜4.5 (8)
wherein,
f 3: a focal length of the third lens group.
9. The imaging lens according to claim 1 or 2,
the first lens group includes a cemented lens in which a biconvex lens and a biconcave lens are cemented in this order from an object side.
10. The imaging lens according to claim 1 or 2,
the second lens group is composed of 1 negative lens or a cemented lens in which 1 negative lens and 1 positive lens are cemented.
11. The imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (1-1):
0.54＜-f2/f＜0.85 (1-1)。
12. the imaging lens according to claim 2,
the imaging lens satisfies the following conditional expression (2-1):
67＜vn2＜88 (2-1)。
13. the imaging lens according to claim 3,
the imaging lens satisfies the following conditional expression (3-1):
0.3＜f1/f3＜0.8 (3-1)。
14. the imaging lens according to claim 4,
the imaging lens satisfies the following conditional expression (4-1):
0.15＜(R3r-R3f)/(R3r+R3f)＜0.45 (4-1)。
15. the imaging lens according to claim 5,
the imaging lens satisfies the following conditional expression (5-1):
0.65＜f1/f＜1 (5-1)。
16. the imaging lens according to claim 6,
the imaging lens satisfies the following conditional expression (6-1):
0.65＜f3/f＜1.9 (6-1)。
17. the imaging lens according to claim 7,
the imaging lens satisfies the following conditional expression (7-1):
0.6＜-f1/f2＜1.4 (7-1)。
18. the imaging lens according to claim 8,
The imaging lens satisfies the following conditional expression (8-1):
1.6＜-f3/f2＜4 (8-1)。
19. the imaging lens according to claim 1 or 2,
the imaging lens satisfies the following conditional expression (1-2):
0.62＜-f2/f＜0.85 (1-2)。
20. an image pickup apparatus is characterized in that,
the imaging device is provided with the imaging lens according to any one of claims 1 to 19.
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- 2016-02-04 CN CN201620114724.3U patent/CN205507204U/en active Active
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Also Published As
| Publication number | Publication date |
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| JP6320949B2 (en) | 2018-05-09 |
| JP2016148793A (en) | 2016-08-18 |
| US20160238819A1 (en) | 2016-08-18 |
| US9651760B2 (en) | 2017-05-16 |
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